Siloxane-modified carbamic acid derivatives

ABSTRACT

NEW ORGANOSILOXANE-MODIFIED CARBAMIC ACID ESTERS COMPRISE AT LEAST ONE STRUCTURAL UNIT OF THE FORMULA   (O(3-M/2)-SI(-R&#39;&#39;)M-CH(-R&#34;)-N(-R&#34;&#39;&#39;)-COO-(CNH2N-O)B)C-Q   AND OPTIONALLY FURTHER STRUCTURAL UNITS OF THE FORMULA R&#39;&#39;A-SI-O/4-A WHEREIN HOWEVER AT LEAT ONE OF EVERY THOUSAND STRUCTURAL UNITS CORRESPONDS TO THE FIRST OF THE ABOVE FORMULAE. IN THESE FORMULAE R&#39;&#39; AND R&#34; ARE MONOVALENT HYDROCARBON RADICALS OF UP TO 10 CARBON ATOMS, R&#34; IS A HYDROGEN ATOM, AMETHYL RADICAL OR A PHENYL RADICAL. Q IS A MONOVALENT TO HEXAVALENT HYDROCARBON RADICAL HAVING UP TO 6 CARBON ATOMS, M IS 0, 1 OR 2, N IS 2, 3 OR 4, A IS 0, 1, 2 OR 3, B IS ZERO OR AN INTEGER FROM 1 TO 200, AND C IS THE VALENCY NUMBER OF Q. THESE CARBAMIC ACID DERIVATIVES ARE PREPARED EITHER BY HYDROLYZING A CORESPONDING, ALKOXYSILY-SUBSTIUTED CARBAMIC ACID ESTER, OPTIONALLY IN ADMIXTURE WITH HYDROCABON-SUBSTITUTED ALKOXYSILANES, OR BY REACTING A CORRESPONDING AMINOMETHYL-SUBSTITUTED POLYSILOXANE WITH A CHLOROFORMIC ACID ESTER OF THE FORMULA (CL-COO-(CNH2N-O)B)C-Q IN THE PRESENCE OF A TERTIARY AMINE. THE PRODUCTS ARE TO BE USED AS PRIMING AGENTS IMPARTING ADHESION TO SYNTHETIC RESINS ON SILICEOUS SURFACES, AS SURFACTANTS AND AS INTERMEDIATES FOR ORGANO-POLYSIOLOXANE RESINS.

United States Patent Oflice US. Cl. 260448.2 N 7 Claims ABSTRACT OF THE DISCLOSURE New organosiloxane-modified carbamic acid esters comprise at least one structural unit of the formula II R!!! a and optionally further structural units of the formula R'asio wherein however at least one of every thousand structural units corresponds to the first of the above formulae.

In these formulae R and R' are monovalent hydrocarbon radicals of up to carbon atoms, R" is a hydrogen atom, a methyl radical or a phenyl radical. Q is a monovalent to hexavalent hydrocarbon radical having up to 6 carbon atoms, m is 0, l or 2, n is 2, 3 or 4, a is 0, 1, 2 or 3, b is zero or an integer from 1 to 200, and c is the valency number of Q.

These carbamic acid derivatives are prepared either by hydrolyzing a corresponding alkoxysilyl-substituted carbamic acid ester, optionally in admixture with hydrocarbon-substituted alkoxysilanes, or by reacting a corresponding aminomethyl-substituted polysiloxane with a chloroformic acid ester of the formula in the presence of a tertiary amine.

The products are to be used as priming agents imparting adhesion to synthetic resins on siliceous surfaces, as surfactants and as intermediates for organo-polysiloxane resins.

and optionally further structural units of the general formula R' SiO in which compounds, however, at least one of every thousand structural units corresponds to the general Formula 1.

In these formulae, and also in any subsequent formulae,

R is an optionally halogen-substituted or cyano-substituted 3,658,864 Patented Apr. 25, 1972 alkyl, cycloalkyl or aryl radical having up to 10 carbon atoms,

R is a hydrogen atom or a methyl or phenyl radical,

R" is an alkyl, cycloalkyl, alkenyl, aralkyl, dialkylaminoalkyl, aryl or alkaryl radical having up to 10 carbon atoms,

Q is a monovalent to hexavalent saturated aliphatic hydrocarbon radical having up to 6 carbon atoms,

m is 0, 1 or 2,

n is 2, 3 or 4,

ais0,1,2or 3,

b is zero or an integer from 1 to 200, and

c is the valency number of Q,

with these radicals and numbers being chosen independently of one another at any point of a molecule.

These compounds are suitable for use as adhesion-promoting intermediate layers on siliceous surfaces which are to be coated with plastics, for example polyurethanes, and also as surface (interface)-active agents and as intermediates for the manufacture of organopolysiloxane resins.

The present invention also provides a process for the production of these compounds, in which a silyl-substituted carbamic acid derivative of the general formula in which, as also in the subsequent formulae, R is an alkyl or cycloalkyl radical having up to 6 carbon atoms or a phenyl radical,

or a mixture of such derivatives, or a mixture of these derivatives with compounds of the general formula is reacted, at a temperature between 20 and C., with at least half a mol of water per gram equivalent of the RO radicals.

In an alternative method for the production of these new compounds, an aminomethyl-substituted polysiloxane which consists of at least one structural unit of the general formula and further structural units, each of which can individually correspond either also to this formula or, up to a total of less than a thousand times the number of units of this formula, to the general formula is reacted with a chloroformic acid ester of the general in the presence of a tertiary amine at a temperature of between 20 and C., optionally in the presence of an inert solvent. I

For the former hydrolytic reaction recited above, it is advantageous to use aqueous hydrochloric acid containing 0.5 to 10 percent by weight of l-ICl, in place of pure water in order to accelerate the reaction, and to use two to five times the minimum amount thereof. Acids of low volatility can also be used, but have to be neutralized with sodium hydroxide or triethylamine before isolating the reaction product. The hydrolysis can also be carried out in the presence of a solvent as is sometimes usual for such hydrolytic reactions, such as ethanol, toluene or tetrahydrofurau. After completion of the reaction and, if required, neutralization, the product is freed from the volatile components of the reaction mixture by heating under reduced pressure, and from the salt which may have precipitated, by filtration or by centrifuging.

The silyl-substituted carbamic acid derivatives which are to be subjected to the hydrolysis are obtained, according to a process described in our copending patent application Ser. No. 881,622 filed Dec. 2, 1969, by reacting an aminomethylsilane derivative of the general formula (RO) mSi(R) C H-NH RI! RI! I with a chloroformic acid ester of the general formula in the presence of a tertiary amine at a temperature of between 20 and 150 C., optionally in the presence of an inert solvent.

Preferably, a temperature between 50 and 120 C. should be chosen for this reaction. The tertiary amine, for example triethylamine or pyridine, serves to bind the acid. Toluene or cyclohexane can for example be used as the inert solvent.

For the alternative process for the production of the compounds according to the present invention, aminomethyl-substituted polysiloxanes are used, such as are obtainable according to known methods, for example by hydrolysis and condensation of corresponding alkoxysilanes of the general formula or of mixtures of these alkoxysilanes and of those of the general formula In cases where, per hundred structural units of the process product 70 or more are to be units of the general formula a further method which is advisable is that in which halogenomethyl-substituted polysiloxanes consisting of structural units of the general formulae are reacted with ammonia or primary amines of formula R"NH to give the corresponding aminomethyl-substituted polysiloxanes. It is known that the above mentioned aminomethylsilane derivatives of the general formula (RO--)amSi(R)m-CHNH RI! R! are also obtained in an analogous manner. In all these cases it is advantageous to use amines which boil above 50 C., for example cyclohexylamine, and in particular in such amounts that they function as well as a reaction component for the product to be obtained, as also as an acid-binding agent and as a diluent. The reaction is then allowed to take place at a temperature of between 50 and 120 C. and after filtering off the ammonium halide which has precipitated and removing the excess amine from the filtrate by distillation, the aminomethylsilicon compounds are obtained as a residue.

The chloroformic acid esters used as reactants as described above are obtained according to known processes by reaction of phosgene with hydroxyl compounds of 4 EXAMPLE 1 50 g. (0.158 mol) N-cyclohexyl-N-(methyldiethoxysilylmethyl)-urethane of the formula (C H 0) Si(CH )CH2III-fiOC H are mixed with 3.75 g. (0.032 mol) trimethylethoxysilane, 40 cm. ethanol and 18 cm. aqueous hydrochloric acid containing 0.5 percent by weight HCl. For the hydrolysis, the mixture is heated to the boil for 4 hours under reflux and easily volatile constituents are then removed therefrom by reducing the pressure to 12 mm. Hg and heating to 100 C. The clear yellow residue which barely flows at room temperature is the reaction product of the formula Si(CHa)3 having a refractive index n =1.4460. 98 g. (0.4 mol) thereof and 44 g. (0.44 mol) triethylamine are dissolved in 250 cm. toluene and 45.8 g. (0.42 mol) chloroformic acid ethyl ester are added thereto over the course of 15 minutes. Thereafter the reaction mixture is heated to the boil under reflux for one hour and the triethylammonium chloride which has precipitated is filtered off after cooling. Distillation of the filtrate through a column yields, at 0.1 mm. Hg and between 96 and 100 C., the ester to be used according to Examples 1 and 2, having a refractive index n 1.4562.

EXAMPLE 2 46 g. (0.145 mol) N-cyclohexyl-N-(methyldiethoxysilylmethyD-urethane are mixed with 21.5 g. (0.145 mol) dimethyldiethoxysilane, 3.5 g. (0.029 mol) trimethylethoxysilane and 33 cm. normal aqueous hydrochloric acid, and the mixture is heated for 4 hours to C. Thereafter 75 cm. of cyclohexane are added, the aqueous phase is separated off, and the siloxane solution is freed of the volatile constituents at 15 mm. Hg. and at most C. A clear yellowish oil is left, having a composition corresponding to the formula EXAMPLE 3 ether of which the composition on average corresponds to 11 g. (0.11 mol) triethylamine and 61.6 g. (0.1 gram the formula equivalent) methyl-(isobutylaminomethyl)-polysiloxane of the formula 2 4 -)1s( a a )id 4 9 Ha)zSi- -si(cH3) si cHa)2oa i cHm.

I H H2 $11 NH NH I|-IH a)2CH-3Hz Hz- K 3 z CH2CH(CH;)1

are dissolved in 100 cm. anhydrous toluene. 174 g. (0.1 mol) hl f r i v i polyglycol ester f the formula with the phosgene dissolving whilst the temperature rises to 35 C. Thereafter the reaction mixture is heated for leg, 15 2 hours to 80 C. and freed of excess phosgene at this I L temperature by reducing the pressure to 12-14 mm. Hg. This treatment is stopped when the chlorine content of the are added to this solution, after which the temperature of reaction mixture, determined by repeated titration, no this reaction mixture rises to 48 C. Thereafter the mixlonger f ll The residual light brown on on average has ture 1S heated for one hour at 100 C., the ammonium salt the composition of a chloroformic acid polyglycol ester which has precipitated 1s filtered off, and the filtrate is f the f l givenin the example freed of volatile constituents at 0.5 mm. Hg and at most 100 C. The reaction product remains as a clear light EXAM LE 4 brown oil which is soluble in water and of which the composition essentially corresponds to the formula 137 g. (1.37 mols) triethylamme and 791 g. (1.25 gram (CHQzSi-O- Si(GH )O-- (Si(CH3)r-O-) -Si(CHa)2 0 H2 H 0 H2 0 GO-t'i-Iq li-iL-OG 1 I--i :0G tampon-CH2 JHrCH(CH3)2 2 CHz-CH(CH;;) wherein --OG denotes the radical equivalents) methyl (cyclohexylaminomethyl)-polysiloxane of the formula E( 4 -)18( a 6 )id i s 1 The isobutylaminomethyl-substituted polysiloxane to be I T SiCHs used for this reaction can be manufactured as follows: A mixture of 3870 g. (30 mols) dimethyldichlorosilane, 624 g. (3 mols) methyl-(bromomethyl)-dichlor0silane H and 562 g. (3 mols) dimethyl-(bromomethyl)-chlorosilane is allowed to run gradually into 10 litres of water. 40 After complete hydrolysis the oil phase is separated oft wherein the number 3p of the difunctional siloxane units and dried; '3 percent by weight of hydrogen-mont-morilper molecule is on average 19, are dissolved in 2 litres lonite are added thereto and the mixture is heated for 5 anhydrous toluene. 2350 g. (1.375 mols) of the chlorohours to 150 C. in order to equilibrate the polysiloxane; formic acid polyglycol ester described in Example 3 are the mixture is then filtered. The filtrate obtained is a methadded to this solution over the course of 25 minutes, duryl-(bromomethyl)-polysiloxane containing 15 percent by ing which time the temperature of the reaction mixture weight of Br, the composition of which on average correrises to C. The mixture is then heated for one hour sponds to the formula to 100 C., the salt which has precipitated is filtered 01f Si (0H3) 2O{(Si (0H3) (CHzB r) 0- (Si c H3)z-0-) 2o -Si (CH3) 3 1940 g. thereof are mixed with 2060 g. (29 mols) isoafter cooling and the filtrate is freed of easily volatile butylamine and the mixture is gradually heated to the boil constituents by reducing the pressure to 0.5 mm. Hg and under reflux, which is continued for 3 hours. After coolr heating to 100 C. A clear water-soluble honey-yellow oil ing of the reaction mixture the isobutylammonium broof viscosity 1170 cp. at 20 C. remains, the composition mide which has precipitated therein is filtered off and the of which approximately corresponds to the formula SiCHs filtrate is freed of volatile constituents by lowering the The cyclohexylaminomethyl-substituted polysiloxane to pressure to 0.5 mm. Hg and heating to 130 C. After be used for this reaction can be manufactured as follows: again filtering, a filtrate of 50 cp. viscosity at 20 C. is A mixture of 244 g. (1.5 mols) methyltrichlorosilane, obtained, containing 2.27 percent by weight of nitrogen 3095 g. (24 mols) dimethyldichlorosilane and 844 g. in secondary amino groups and 0.24 percent by weight of (4.5 mols) dimethyl (bromomethyl)-chlorosilane is alnitrogen in tertiary amino groups, which is to be reacted lowed to hydrolyze by gradually running it into 5 litres of with the chloroformic acid polyglycol ester in accordance water, and the polysiloxane phase hereby formed is subwith the example described above. sequently separated off, dried and then mixed with 3 The ester can be manufactured as follows: percent by weight of hydrogen-montmorillonite (which 64' g. of phosgene are introduced, whilst stirring, into acts as an equilibration catalyst). This mixture is heated 700 g. of a polyoxyethylene-oxypropylene-mono-n-butyl to C. for 5 hours to equilibrate it and is filtered after cooling. The filtrate contains 12.5 percent by weight of bromine in BrCH groups. 2320 g. thereof are mixed with 2420 g. (24.4 mols) cyclohexylamine and the mixture is heated for one hour to 100 C. whilst stirring. The salt which precipitates in the course thereof is filtered off after cooling, and the filtrate is freed of easily volatile constituents at 0.5 mm. Hg and at most 130 C. and is again filtered. The filtrate has a viscosity of 45 cp. at 20 C. and in addition to 0.07 percent by weight of nitrogen in tertiary amino groups contains 2.21 percent by weight of nitrogen in secondary cyclohexylaminomethyl groups. Its composition is substantially that of the formula given at the beginning of the example.

EXAMPLE 5 2225 g. (1.87 gram equivalents) of a chloroformic acid polyglycol ester of the formula containing 2.95 percent by Weight of chlorine, corresponding to an equivalent weight of 1202 g. that is to say a numerical value r of about 24, are dissolved in 3 litres of toluene. A mixture of 208 g. (2.06 mols) triethylamine and 1090 g. (1.87 gram equivalents) of a methyl (cyclohexylaminomethyl polysiloxane of the formula I L e la with 3s on average equalling 17, is added dropwise to this solution. Thereafter the reaction mixture is heated to the boil under reflux for 2 hours, the triethylammonium chloride which has precipitated is filtered off at room temperature, and the filtrate is freed of solvent initially at 12 mm. Hg and 100 C. and subsequently at 0.5 mm. Hg and 130 C. The residual polysiloxane-modified polyether-carbamate solidifies at room temperature, melts at about 25 C. and has a viscosity of 520 cp. at 30 C. It gives a clear solution in water, and its composition corresponds approximately to the formula SiCH;

SlCH;

[BrGl-I -ESi(CHs)2-O%s]3 SiCH;

containing 15 percent by weight of Br. 1250 g. thereof are then allowed to run dropwise into 1400 g. cyclohexylamine heated to 100 C., and the mixture is kept at 100 C. for a further hour and filtered after cooling. The easily volatile constituents are first removed from the filtrate by heating to 100 C. at 14 mm. Hg and thereafter by two treatments in a thin layer evaporator at 0.5 mm. Hg and 130 C. The residue is filered once more and a light yellow oil of viscosity 42 cp. at 20 C. is obtained as the filtrate, which in addition to 0.08 percent by weight of nitrogen in tertiary amino groups contains 2.4 percent by weight of nitrogen in its secondary cyclohexylaminomethyl groups and which is now to be reacted,

8 as described above, with the chloroformic acid ester of a polyethylene glycol rnonobutyl ether.

This ester can be manufactured by reacting a polyether obtained by ethoxylation of n-butanol, containing 1.63 percent by weight of HO, corresponding to a molecular weight of 1043, with phosgene analogously to the process indicated as an appendix to Example 3.

EXAMPLE 6 71 g. (0.7 mol) triethylamine and 598 g. (0.5 gram equivalent) of a methyl-(cyclohexylaminomethyl)-polysiloxane of the formula are dissolved in 1.5 litres anhydrous toluene. 138 g. (0.5 gram equivalent) octaethylene glycol-bis-chloroformic acid ester containing 12.9 percent by weight of chlorine are added to this solution, in the course of which the temperature of the reaction mixture rises to 45 C. The mixture is heated to the boil under reflux for 2 hours, the triethylammonium chloride which has precipitated is filtered oif at room temperature and the filtrate is freed of the solvent by heating to C., first at 14 mm. Hg and subsequently at 0.5 mm. Hg. The reaction product which remains is a clear light yellow oil of 3650 cp. viscosity at 20 C., consisting of polymer segments of the formula The cyclohexylaminomethyl-substituted polysiloxane to be used in this example can be manufactured by first heating a mixture of 866 g. (2.92 mols) octamethylcyclotetrasiloxane, 133.5 g. (0.417 mol) 1,3 di-(bromomethyl)- tetramethyldisiloxane and 30 g. hydrogen-montmorillonite for 5 hours at C. for equilibrating redistribution of the siloxane units, and filtering the polysiloxane thus obtained, containing 6.5 percent by weight of H C- bonded bromine and having an average composition of the formula after it has cooled. 934 g. of the filtrate are then allowed to run dropwise into 500 g. of cyclohexylamine heated to 80 C., and the mixture is heated to 100 C. for one hour whilst stirring and is filtered after having cooled to room temperature. The filtrate is freed of easily volatile constituents by heating to C. at 14 mm. Hg and is thereafter again filtered. The filtrate is a yellow oil of viscosity 43 cp. at 20 C., which in addition to 0.05 percent by weight of tertiary-bonded nitrogen contains 1.17 percent by weight of nitrogen in its secondary cyclohexylaminomethyl groups, and the composition of which essentially corresponds to the formula given at the beginning of the example.

9 10 What we claim is: 4. A compound according to claim 1, having the for- 1. Nonreslnous siloXane-modified carbamic acid derivamula L I (CH3)S|1 o S1(OH3)O (-s1(cH )2o)m-s1(om CH2 CH2 0 CH2 0 t I I t l! N N -OG N 0G (CHa)2CH-H2 CHz-CH(CH3) z H2CH(OH3)2 tives consisting of at least one structural unit of the genwherein OG denotes the radical eral formula 0 Q o- :(c2Hi-ooint-o oin,

M j, J

2 RI! R!!! a and further structural units each of which is individually 5. A compound acording to claim 1, having the forselected from the group consisting of units corresponding mula to the above formula and, up to a total of less than a wherein the number 3p of the difunctional siloxane units thousand times the number of units of said formula, of per molecule is on average 19. units corresponding to the general formula 6. A compound according to claim 1, having the for- R'aSiO mula kn T in which formulae R is a radical having up to 10 carbon atoms, selected C ,l l signs from the group consisting of alkyl, cycloalkyl, aryl, r It I L .L halogenated alkyl, cycloalkyl and aryl, and cyanosubstituted alkyl, cycloalkyl and aryl, H

R" is selected from the group consisting of a hydrogen atom, a methyl radical and a phenyl radical, 40 :1

R' is a radical having up to 10 carbon atoms, selected from the group consisting of alkyl, cycloalkyl, al-

kenyl, aralkyl, dialkylarninoalkyl, aryl and alkaryl, wherein the numerical value r is about 24, and the number Q is a monovalent to hexavalent saturated aliphatic hy- 3s of the difunctional siloxane units per molecule is on drocarbon radical having up to 6 carbon atoms, average 17. m is selected from 0, 1 and 2, 7. A compound according to claim 1, consisting of n is selected from 2, 3 and 4, polymer segments of the formula a is selected from 0, 1, 2 and 3, b is selected from 0 and the integers from 1 to 200,

c is the valency number of Q, the above defined radicals and numbers being selected H independently of one another at any point of a molecule.

2. A compound according to claim 1, having the foro mula 0si(0H )2 -0-si(CH3)2CH21 I 0 CzH40 CHg L J14 /3 (CHa)aSi0Si(CH )0 S1(CH3)3 f H --s' CH) o--s CH CH-NCO-CHO H In L1(32 JH1(3)2 2 I \24/ N-C--O--CZH5 References Cited 3. A compound according to claim 1, havlng the for- UNITED STATES PATENTS l a 2,973,383 2/1961 Black 260-4482 N s s 2,928,858 3/1950 Morehouse 260448.8 R

TOBIAS E. LEVOW, Primary Examiner ib P. F. SHAVER, Assistant Examiner US. Cl. X.R.

117-123 C, 123 D; 252-3S7, 'DIG. 1; 2'60-46.5 E, 46.5 G, 46.5 Y, 448.8 R

v UNITED STA'iES PATENT OFFi'CE CERTWEQATE 0i CGREQTEN Patent No. 3 5 ,864 Dated April 25 1972 Inventor(s) Hans Dietrich GOlitZ et a].

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. 4 line 67 "(CH should be (CH Signed and sealed this 1st day of May 1973.,

(SEAL) Attest:

EDWARD M. FLETCHER, JR. I ROBERT 'GOTTSCHALK Attesting Officer 1 Commissioner of Patents FORM PO-IOSO (O-69) USCOMM'DC 60376-P59 fi' 0.5. GOVZRNMEN RINTING UNITED STATES iPATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 Dated April 25, 1972 Inventor(s) Hans Dietrich GOlitZ et 81 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. 4 line 67 "(C-H should be (G11 Signed and sealed this 1st day of May 1973.

(SEAL) Attest:

EDWARD M. FLETCHER, 31%. I ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents RM po'wso uscoMM-oc scam-ps9 0.5. GOVIRNMENT PRINTING OFFICE l9! 0-366-334 

